MESON Chess Problem Database

Problem Display
PID: 117162 (4k2r/2p1p3/2p1P3/p5R1/3p4/Kn6/b7/2r2q1Q w k - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Recueil des Problemes, 1958

4k2r/2p1p3/2p1P3/p5R1/3p4/Kn6/b7/2r2q1Q

#2

4 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Qxh8#
    • 1...Qe2
      • 2.Qxh8#
    • 1...Qg2
      • 2.Qxh8#
    • 1...Qd3
      • 2.Qxh8#
    • 1...Qc4
      • 2.Qxh8#
    • 1...Qb5
      • 2.Qxh8#
    • 1...Qa6
      • 2.Qxh8#
    • 1...Qd1
      • 2.Qxh8#
    • 1...Qe1
      • 2.Qxh8#
    • 1...Qg1
      • 2.Qxh8#
    • 1...c5
      • 2.Qa8#
  • Tries
    • 1.Rxa5?
      • threat
        • 2.Ra8#
      • 1...Kd8
        • 2.Ra8#
      • 1...Kf8
        • 2.Qxh8#
      • 1...0-0
        • 2.Rg5#
      • 1...Qb5
        • 2.Qxh8#
      • 1...Qa6
        • 2.Qxh8#
      • 1...Sxa5!
    • 1.Qxc6+?
      • 1...Kd8
        • 2.Qd7#
        • 2.Qa8#
      • 1...Kf8
        • 2.Qa8#
      • 1...Rxc6!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Rb8#
      • 1...Kd8
        • 2.Rb8#
      • 1...Kf8
        • 2.Qxh8#
      • 1...0-0
        • 2.Rg5#
      • 1...Qxb5
        • 2.Qxh8#
      • 1...cxb5
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • K(j);P-FLIGHT,S_CUTQ(b)::QAR2(A),XR(k)
    • Q(b);N_GUARD::QAR(A),XR(k)
    • P(g);OGATE::QAR(A)
  • Tries
    • Try
      • R(C);XP(f)
      • Threat
        • R(C)
      • Vars
        • K(j);P-FLIGHT::R(C)
        • K(j);P-FLIGHT,S_CUTQ(b)::QAR2(A),XR(k)
        • K(j);0-0,OGATEB::R(C)
        • Q(b);N_GUARD::QAR(A),XR(k)
        • Q(b);N_GUARD,P_PINR(C)::QAR(A),XR(k)
      • Refutation
        • S(d);XR(C)
    • Try
      • Q(A);CHECK,XP(g)
      • Vars
        • K(j);P-FLIGHT::QAR(A)
      • Refutation
        • R(a);XQ(A)
  • Actual
    • R(C);
    • Threat
      • R(C)
    • Vars
      • K(j);P-FLIGHT::R(C)
      • K(j);P-FLIGHT,S_CUTQ(b)::QAR2(A),XR(k)
      • K(j);0-0,OGATEB::R(C)
      • Q(b);N_GUARD,XR(C)::QAR(A),XR(k)
      • P(g);OGATE,XR(C)::QAR(A)
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